Interview attire! Help!

What should I wear for an interview? The position is for a teacher at a college.

I've been on very, very few formal interviews, so I'm really clueless.

For those who don't know me, I'm plus sized, so I need something appropriate in that sense as well.

TIA!

i've been going on interviews too and having been wearing these kinds of outfits:

pencil skirt with nice blouse and jacket
nice shell dresses with jacket (i've been carrying my jacket and often not putting it on since it's so hot out)
pants suit and tank

I would get a skirt suit for the summer.

As someone that worked on a college campus before having a baby (and whose DH is a professor)...

Adjunct position or full time? Also, what college? It all depends. If it's a private campus or religious affiliated campus, definitely full suit/formal. If you're going to a community college or commuter campus, I would say it can be a little more relaxed (I've worn a skirt and white short-sleeved blouse with a pop of green shoes, and it was absolutely fine--they thought I was stylin' ). If it's a liberal arts public school, it can also probably be a little more relaxed.

In short: If the professors are people that wear suits when they teach, do it up in a formal suit. If they dress down when they teach, no need to do the suit--just look nice and no jeans!